I understand where you’re coming from, but not all Discourses are the public forums with thousands of users. My Discourse is a small, private community. I know many of our users personally, since they are members of our organization and we meet face-to-face at least once a year.
We currently use MailChimp for sending announcements, but for simpler communications we’ve began to use an “Announcement” category on Discourse. A select group of institutional liaisons and committee members (about 30-40 users) is set to “watch first post” on that category. The rest will receive it a few days later in their weekly digest. Using Discourse for announcement also has the advantage that people can reply to them, asking for clarifications, etc.
We occasionally have important, time-sensitive communication that needs to go out. To avoid the hassle of setting up a Chimp, I tried yesterday to post in this Announcement category while mentioning @trust-level-0. It took a couple of tries, but it’s worked, and we already have the kind of positive responses that we were expecting.
The “handy shortcut” is not to make it easier for me, but to make it less weird for users, who are already on their guard with Discourse. They feel it’s a very geeky platform, what with all those asterisks and whatnot.
So that’s my use case. Granted, it may be so a niche, that you aren’t interested in accommodating it in core. But I don’t think that any of the above ranks as dangerous